Glaucoma (H40-H42) ICD-10-CM
The H40–H42 section covers glaucoma with 320 ICD-10-CM diagnosis codes, of which 253 are billable in fiscal year 2026. The section is organized into the 2 code ranges listed below.
Code Ranges in This Section 2 ranges · 320 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| H40 | Glaucoma (H40) | 319 | 252 |
| H42 | Glaucoma in diseases classified elsewhere (H42) | 1 | 1 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the H40–H42 Code Range
ICD-10 codes H40-H42 are used to classify various types and stages of glaucoma, a group of eye conditions that can cause optic nerve damage usually linked to high intraocular pressure. This range includes codes for glaucoma suspects, open-angle and angle-closure glaucomas, secondary glaucomas related to trauma, inflammation, drugs, or other eye disorders, as well as glaucoma associated with systemic diseases.
The H40 series offers specific codes for different forms such as primary open-angle glaucoma, which also covers stages from mild to severe, and angle-closure glaucomas including acute and chronic types. Synonyms like "glaucoma suspect," "primary angle closure," or "pigmentary glaucoma" correspond to exact codes (e.g., H40.001 for glaucoma suspect right eye, or H40.13 for pigmentary glaucoma). Secondary glaucomas triggered by eye trauma (H40.3), inflammation (H40.4), or drugs (H40.6) have their own detailed subcategories with bilateral or unilateral designations and severity stages. The codes also address ocular hypertension (H40.05) and residual or unspecified glaucoma forms. Lastly, H42 covers glaucomas due to other underlying systemic or eye diseases, bridging the gap between primary eye disorders and broader medical conditions, including terms like "neovascular glaucoma due to diabetes" or "glaucoma due to systemic syndrome." These codes help healthcare professionals accurately document the type, cause, laterality, and stage of glaucoma, essential for clinical management and coding precision.
Questions About This Page
How many codes are in the H40-H42 range?
The H40-H42 range contains 320 ICD-10-CM diagnosis codes in FY 2026. 253 of them are billable, and the rest are category headers that organize the section.
What conditions does H40-H42 cover?
The range covers glaucoma. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
